Gestation stalls prevent sows from turning around for most of their productive life, and international efforts to phase them out represent a significant animal welfare advance.
Gestation stalls prevent sows from performing basic natural behaviours including turning around, social interaction, and rooting. The resulting frustration and boredom causes stereotypic behaviours including bar biting and sham chewing. Sows in stalls cannot escape aggressive social interactions or perform comfort behaviours. The welfare improvement from stall-free housing is significant but requires investment in facility redesign and management.